Journal
VETERINARY PARASITOLOGY
Volume 292, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.vetpar.2021.109416
Keywords
Anticoccidial drug; Vaccine; Eimeria; Coccidiosis; Chicken; Eimeria acervulina
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Vaccination restored sensitivity to anticoccidial drugs in field isolates of Eimeria acervulina obtained from commercial broiler enterprises, improving resistance to coccidiosis.
The efficacy of the anticoccidial drugs amprolium, clopidol, diclazuril, monensin, monensin + nicarbazin, narasin, narasin + nicarbazin, and salinomycin against field isolates of Eimeria acervulina obtained from a commercial broiler enterprise before and after immunization with a coccidiosis vaccine was investigated. Evaluated by weight gain, feed conversion, and lesion score following challenge, the isolate obtained before vaccination was resistant to all the drugs tested. By contrast, after vaccination the isolate was sensitive to all drugs evaluated by weight gain, and to most drugs judged by feed conversion and lesion score. It is concluded that vaccination had resulted in the restoration of sensitivity to these drugs.
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